#include<vector>
using std::vector;
#include<iostream>
int main()
{
	vector<int> vi;
	vi.push_back(2);
	vi.push_back(1);
	vi.push_back(4);
	vector<int>::iterator it=vi.begin();
	vi.erase(it);
	std::cout<<"now vi size:"<<vi.size()<<std::endl;
	std::cout<<*it<<std::endl;
	return *it;
}
